Battery charging method
OwnerJohn W. Lundstrominventor
Life of this patent
Estimating the term…
Abstract
A backup battery charger measures charging capacitor voltage and charging battery current to calculate battery charging circuit resistance and open circuit float battery voltage. Microcontroller computation of the backup battery float battery voltage and battery charging circuit resistance changes enable efficient charging and monitoring of battery conditions.
Claims7
A method for determining battery charging circuit resistance R of a charging resistance loop extending through a charger and a storage battery, the method comprising the steps of,
- charging the storage battery coupled to a charging capacitor in the charging loop,
- measuring a voltage V1 across a charging capacitor at a time t1 when the battery is charged by energy supplied by the charging capacitor,
- measuring a current I1 conducting through the battery at the time t1,
- measuring a voltage V2 across the charging capacitor at a time t2 when the battery is charged by energy supplied by the charging capacitor at time t2,
- measuring a current I2 passing through the battery at time t2, and
- calculating the battery charging circuit resistance R across the charging capacitor and through the battery, and
- measuring a voltage Vave across the charging capacitor at time td between time t1 and time t2,
- measuring a current Iave conducting through the battery at time td, and
- determining an open circuit battery voltage Vb using R, Vave and Iave.
A method for determining battery charging circuit resistance R of a charging resistance loop extending through a charger and a storage battery, the method comprising the steps of,
- charging the storage battery coupled to a charging capacitor in the charging loop,
- measuring a voltage V1 across the charging capacitor at a time t1 when the battery is charged by energy supplied by the charging capacitor,
- measuring a current I1 conducting through the battery at the time t1,
- measuring a voltage V2 across the charging capacitor at a time t2 when the battery is charged by energy supplied by the charging capacitor at time t2,
- measuring a current I2 passing through the battery at time t2, and
- calculating the battery charging circuit resistance R across the charging capacitor and through the battery, and
- detecting changes in the battery charging circuit resistance R, and
- terminating charging of the storage battery.
A method for determining battery charging circuit resistance R of a charging resistance loop extending through a charger and a storage battery, the method comprising the steps of,
- charging the storage battery coupled to a charging capacitor in the charging loop,
- measuring a voltage V1 across the charging capacitor at a time t1 when the battery is charged by energy supplied by the charging capacitor,
- measuring a current I1 conducting through the battery at the time t1,
- measuring a voltage V2 across the charging capacitor at a time t2 when the battery is charged by energy supplied by the charging capacitor at time t2,
- measuring a current I2 passing through the battery at time t2, and
- calculating the battery charging circuit resistance R across the charging capacitor and through the battery.
Dependencies are inferred from the claim text.